Olivia, Mobilized for War
Umbral Collar Zealot
Grim Haruspex

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
The persist creature does not have a -1/-1 counter on it.

   Steps

How does this combo work?
1
Activate Umbral Collar Zealot by sacrificing the persist creature.
2
When the persist creature dies, it and Grim Haruspex trigger.
3
Resolve the Grim Haruspex trigger, causing you to draw a card.
4
Resolve the persist creature's trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
5
When the persist creature enters the battlefield, Olivia triggers, putting a +1/+1 counter on the persist creature and causing you to discard a card.
6
Resolve the Umbral Collar Zealot ability.
7
Repeat.

   Results

What do I get from this combo?
Infinite self-discard triggers
Near-infinite ETB
Infinite draw triggers
Infinite looting
Near-infinite LTB
Near-infinite death triggers
Near-infinite sacrifice triggers
Near-infinite surveil
Marchesa, the Black Rose
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Olivia, Mobilized for War
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Alesha, Who Laughs at Fate
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